Oil-immersion-type microscope objective

ABSTRACT

A five-member microscope objective having a numerical aperture of substantially 1.25 and a magnification of substantially 100 X .

OIL-lMMERSlON-TYPE MICROSCOPE OBJECTIVE [50] Field olSearch 350/176.l77.1l4-2l6 [56] References Cited UNITED STATES PATENTS 3.437.398 4/1969Muller elal. 0. 350/216 X 3,497,290 2/1970 Roscnberger 350/2l6 X PrimaryExaminer.lohn Ki Corbin Attorneys-William C. Nealon. Noble S. Williamsand Robert 1. Bird 2 Claims. 1 Drawing Fig.

U.S.Cl 7. 350/176,

350/ 75 ML. 350/177, 350/214, 3 /216 ABSTRACT: A five-member microscopeobjective having a Int-Cl Gozb numerical aperture of substantially 1.25and a magnification 6 21/ ofsubslantially l00 X.

lparuliel light m RIZ Rll

PAlENlElllluclolsn I $598,474

lparollel light R M RIS Rll

INVENTOR.

ARTHUR H. SHOEMAKER *wyw ATTORNEY BACKGROUND OF THE INVENTION Thepresent invention relates to a microscope objective.

Positive doublet 4 includes a planoconvex lens I and a concavo-convexlens ll. Lens 6 is a concavo-convex positive meniscus lens. alsodesignated as lll. Doublet 8 includes a convex-concavo lens IV and adouble convex lens V together lpamculu an achmmauc immersion microscopeforming a positive double convex doublet. Double! in- 0 f h Y I eludes aconvex-concavo lens VI and a double convex lens F 9 t e a 'l 'P achro'Vll. together forming a negative double convex doublet. mam fi i WW 3numencal @penure of Doublet 12 includes a double convex lens Vlll and adouble f y a F of sulsmmlany moxi concave lens lX, together forming anegative convex-concave in which chromatic and spherical aberrations,coma, and 0 doubleL 'l corrected f' Provldmg a The lens parameters areas follows: The successive lens radii when used 3 tclesclope oblficuveare designated Rl-RM whereaminus sign indicates radii on m and Cale"centers of curvature lying on the object side of their vertices. DRAWINGThe axial thicknesses of successive lens elements are I designatedTl-T9. The successive axial spaces from the oblmlcmscope j IP' by a jectplane are designated 81-85. The refractive indices of the p y"cwedllamvemly lhelfaxli successive lens elements are designated ND1ND9.The Abbe numbers of the successive lens elements are designatedDESCRIPTION all-v9 respectively. Referring now to the drawing. amicroscope objective is -The above-mentioned parameters are related tothe focal shown at 2. It includes a front doublet 4, a single lens 6, alength according to the following constructional data:

lMagnlfication=l00X N. A.=1.25] l Reiractive Abbe Lens Radius (R)Thickness (T) Space (8) index (ND) Nzninber S1=.1696F R1=Plano ITi=.3173F ND1=1.51700 vl=654 i RE -.9047! II T2=l.6971F ND2=L96028r2=34.92

S2=.0109F R4==-o.120sF III T3=L1183F ND3=L78833 vii-50.47

R5=3.38(BF S3=.164IF R6=8.7625F Iv T4=.e702F ND4=Ls0491 r4-26.42

R7=4A648F V... I5=2.5596F ND6=L48651 r6=84.46

S4=.0279F I R9==l4.2l90F I vI T6=.6374F ND6-L8049l r6=25.42

R10=3.1s49F i VII T7=2.7766F ND7=L48651 v7=84.46

, S5=8.3214F R12=3L4373F VIII T8=l.1676F ND8=1.75496 vs=27.57

R13=-3.4557F IX T9=.9887F ND9=L61328 v9=44.28 R14==4.2716F l doublet 8,a doublet l0, and a doublet 12, all of said lenses being in axialalignment. Objective 2 is disposed relative to an object plane 14 asshown in the drawin g. A capillary oil space The foregoing parameters ofradius, thickness and space are based on the value of F. The value of Fin this case. as an example, is 1.8277 millimeters. Given in numbers,the foregoing exists between plane 14 (or ob ect O thereon) and doublet4. data is as follows:

[F=-1.8277 Magniflcation=X N A.1.25]

Thickness Refractive Abbe Lens Radius (R) (T) Space (S) index (ND)Nu(n;ber

I I s1=.31 R1=Piano I T1=.68 ND1=L617 r1=64.54

R2=1.6535 II i T2=2.919 ND2=1.96028 r2=34.92

S2=.02 R4=11.187 III t T3=2J344 ND3=L73833 r3=50.47

sa=.a0o R6=15.997 [V. T4=L225 I ND4=L8U491 v4=25.42

R7=8.142 l V f T5=4.678 I ND5=L48651 v6=84A6 R8=-8.l42 i S4=.051R9=25.98B VL. T6=L166 ND6=L80491 v6=25.42

R10=5.821 VII s T7=6.073 ND7=1A8651 v7=84.40

R11=-24.33i l S6=l5.2)9 Rl2=67.458 VIII T8-2J34 ND8- L75496 8-27.57

R13-7.316 IX {Pg-L807 ND9-L6i328 v9=4438 El i-7.807 I it will beapparent that the foregoing absolute values are variable depending onthe value of F. Other forms are thus possible and changes may be made inthe values of the constructional data based on the relationships in thefirst of the plane (SI-S), refractive indices (NDl-NDJ). and Abbenumbers (vi-v9). being determined by the following relationship:

above charts, without departing from the spirit of this invention.

What I claim is:

I. An achromatic microscope objective having a magnifica tion ofsubstantially lOOX and a numerical aperture of subwherein scalar valuesare given in millimeters.

2. An achromatic microscope objective having a magnification ofsubstantially lOOX and a numerical aperture of substantially 1.25 forforming an image of an object plane, said image being well corrected forspherical and chromatic aberstantially L25 for forming an image of anobject plane, said rations, coma, astigmatism and curvature of imagefield, said image being well corrected for spherical and chromaticaberobjective comprising: rations. coma, astigmatism and curvature ofimage field, said a front planoconvex lens member I; objectivecomprising: a second concave-convex lens member ll;

a front planoconvex lens member I; said front and second members forminga doublet; a second concave-convex lens member ll; a thirdconeavo-convex lens member lll; said front and second members forming adoublet; I a fourth convex-concavo lens member IV; a thirdconcave-convex lens member ill; a fifth double convex lens member V; afourth convex-concave lens member W; said fourth and fifth membersforming a doublet; a fifth double convex lens member V; a sixthconvex-concave lens member VI; said fourth and fifth members fonning adoublet; a seventh double convex lens member Vll; a sixth convex-concavelens member VI; said sixth and seventh members forming a doublet; aseventh double convex lens member Vll; an eighth double convex lensmember Vlll; said sixth and seventh members forming a doublet; a ninthdouble concave lens member lX; an eighth double convex lens member Vlll;said eighth and ninth members forming a doublet; a ninth double concavelens member lX; all of said lens members being axially aligned; and saideighth and ninth members forming adoublet; the parameters of lens radii(Rb-R14), lens thicknesses all ofsaid lens members being axiallyaligned; and (Tl-T9), axial spaces among lens elements and object theparameters of lens radii (RI-R14), lens thicknesses plane (SI-S5),refractive indices (NDl-ND9), and (Tl-T9), axial spaces among lenselements and object Abbe numbers (vi-v9) as follows; 4

Thickness Refractive Abb Lens Radius (R) (T) Space (S) index (ND) Nu(n;ber

S1=.31 I R1=PLANO I t Ti=tas I ND1=1.617 v1=64.54

R2=-l.6535 It T2=2.919 ND2=L96028 1 v2=34.92

R3= 2.788 f 1 s'=.02 R4= -11.1s7 [It T3=2.044 ND3=L78833 v3=.'i0.47

R5=6.t79 z r r S3=.300 R6=15.997 i I l\ T4=L225 ND4=1.80491 v4=25.42

R7=s.112 t T5=4.678 ND5=L48651 v5=B4- 6 s4=.o51 R9=25.988 vi.. T6=1.165l ND6=L80491 ys=25.42

; R10=5.821 i VII l T7=5.073 ND7=L48651 V7=84A6 Rll= -24.331 l fss=15.209 I Rl2=57.458 1 Vlll T8=2.134 ND8=1.75496 v8=27.67

1 R18=6.316 l I 1x I T9=1.s07 ND9=L61328 v9=44.28

n14=7.s07 1 I wherein scalar values are given in millimeters.

1. An achromatic microscope objective having a magnification of substantially 100X and a numerical aperture of substantially 1.25 for forming an image of an object plane, said image being well corrected for spherical and chromatic aberrations, coma, astigmatism and curvature of image field, said objective comprising: A FRONT PLANOCONVEX LENS MEMBER I; a second concavo-convex lens member II; said front and second members forming a doublet; a third concavo-convex lens member III; a fourth convex-concavo lens member IV; a fifth double convex lens member V; said fourth and fifth members forming a doublet; a sixth convex-concavo lens member VI; a seventh double convex lens member VII; said sixth and seventh members forming a doublet; an eighth double convex lens member VIII; a ninth double concave lens member IX; said eighth and ninth members forming a doublet; all of said lens members being axially aligned; and the parameters of lens radii (R1-R14), lens thicknesses (T1-T9), axial spaces among lens elements and object plane (S1-S5), refractive indices (ND1-ND9), and Abbe numbers ( Nu 1- Nu 9), being determined by the following relationship:
 2. An achromatic microscope objective having a magnification of substantially 100X and a numerical aperture of substantially 1.25 for forming an image of an object plane, said image being well corrected for spherical and chromatic aberrations, coma, astigmatism and curvature of image field, said objective comprising: a front planoconvex lens member I; a second concavo-convex lens member II; said front and second members forming a doublet; a third concavo-convex lens member III; a fourth convex-concavo lens member IV; a fifth double convex lens member V; said fourth and fifth members forming a doublet; a sixth convex-concavo lens member VI; a seventh double convex lens member VII; said sixth and seventh members forming a doublet; an eighth double convex lens member VIII; a ninth double concave lens member IX; said eighth and ninth members forming a doublet; all of said lens members being axially aligned; and the parameters of lens radii (R1-R14), lens thicknesses (T1-T9), axial spaces among lens elements and object plane (S1-S5), refractive indices (ND1-ND9), and Abbe numbers ( Nu 1- Nu 9) as follows: 